I Dance with Your Shadow: Patch, Stub, Mock
summary
Shows concrete Python testing techniques: how to patch the import location to replace objects in the runtime namespace, when to prefer dependency injection over patching, and the differences between Mock and MagicMock (including autospec and wrapper usage). Demonstrates asserting call patterns and return sequences, and tools for external interactions such as vcr‑pytest to record HTTP interactions and moto to fake AWS; reports benefits for CI speed and cost and warns about re‑recording and stale cassette risks.
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chapters (10)
- 0:00Introduction
- 4:22Simulators
- 6:00Patching - Common Mistakes
- 8:02Patching - Decorator
- 9:15Patching - Context Manager
- 10:38Patching - Scopes
- 12:30Dependency Inversion
- 15:54Mocks - Specs
- 17:52Mock - Assertions
- 19:07VCR - A Recorder
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